Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching
- Title
- Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching
- Author
- Mayur Bharat Kurade
- Keywords
- Acidithiobacillus ferrooxidans; Bioleaching; Extracellular polymeric substances; Sewage sludge; Sludge dewaterability; DIGESTED SEWAGE-SLUDGE; WASTE ACTIVATED-SLUDGE; HEAVY-METALS; PRETREATMENT; EPS; IDENTIFICATION; FLOCCULATION; PERFORMANCE; REDUCTION; SURFACE
- Issue Date
- 2014-10
- Publisher
- Elsevier Science B.V., Amsterdam.
- Citation
- BIORESOURCE TECHNOLOGY, 179권, pp.78-83
- Abstract
- Pretreatment of activated sludge with sulfuric acid and bioleaching using Acidithiobacillus ferrooxidans along with addition of Fe2+ on sludge dewaterability was investigated. The sludge dewatering efficiency in terms of capillary suction time (CST) and specific resistant to filtration (SRF) was increased with a decrease in sludge pH. A pH of 2.67 was found to be optimum for dewatering, at which 81% and 63% reduction of CST and SRF were achieved, respectively. The dewaterability of sludge was enhanced after the addition of Fe2+ and A. ferrooxidans. Ideal concentration of Fe2+ was 2 g/L for sludge dewaterability, which showed 96% and 88% reduction in CST and SRF, respectively. In the control sludge, maximum part of the biopolymeric macromolecules was contributing by the tightly bound extracellular polymeric substances (TB-EPS). At optimum Fe2+ concentration, total EPS was reduced by 73%, enhancing sludge dewaterability. Bioleaching conducted by A. ferrooxidans could solubilized 88% Cu and 99% Zn within 120 h. (C) 2014 Elsevier Ltd. All rights reserved.
- URI
- https://doi.org/10.1016/j.biortech.2014.10.099http://hdl.handle.net/20.500.11754/50325
- ISBN
- 1873-2976
- ISSN
- 0960-8524
- DOI
- 10.1016/j.biortech.2014.10.099
- Appears in Collections:
- INDUSTRY-UNIVERSITY COOPERATION FOUNDATION[S](산학협력단) > ETC
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